I've had little luck with retention. I'm not being offered any dollar incentives, i.e. $150 service credit for two year contract. What I have been offered is the new family plan, which saves $10 month, and a free low end phone to add to the contract (which adds the $10 back on).

So the new deal is 100 extra minutes per month, a free phone added to the plan (for a total of 4), for the same money I'm paying now.